Honing attachment for drill press



Feb. 23, 1960 T. S. DAYTON ET AL HONING ATTACHMENT FOR DRILL PRESS FiledDec. 6, 1957 INVENTORS Theodore SDayi'on BY GordonV.

Da ion @L QD 1 gen-1' United States. Patent G F HONING ATTACHNIENT FORDRILL PRESS Theodore S. Dayton and Gordon V. Dayton, Portland, Oreg.,assignors, by mesne assignments, to Pacific Tool and Manufacturing Co.,Portland, reg., a corporation of Oregon Application December 6, 1957,Serial No. 701,046

6 Claims. c1. 51-34 This invention pertains to apparatus for honingbores to precise dimensions and relates particularly to a novel andversatile honing attachment adapted especially for use with aconventional drill press.

The honing of bores to precise dimensions is a requirement in manyfields of industry. It is a requirement in the manufacture of precisionequipment, in the finishing of cast parts, in the sizing of bushings,and many others. When the parts to be honed are small in size it isdesirable that the same may be held in the hand and passed over a hone.honed is contained within a piece of substantial size and weight, it isdesirable that the same be supported upon a firm base and the honepassed through the bore.

There are several rather elaborate and expensive forms of honingapparatus which provide the versatility of operation indicated above.However, there are innumerable small businesses whose operations dictatethe desirability of having equipment of such versatility, but wholelimited production or budget do not render the purchase of such costlyequipment economically feasible. Such is the case, for example, withautomotive garages in which the normal course of maintenance and repairof automotive equipment, involves the replacement and re-sizing ofbushings. Another example is to be found in the small machine shops inwhich the honing of bushings, castings and other parts of small andlarge dimensions is a frequent though not a large scale requirement.

On the other hand, there are presently available certain types ofrelatively inexpensive honing attachments for drill presses, but all ofthese possess inherent operational limitations which render themunsuitable for most purposes. Most serious of these limitations is thenecessity to shut down the drill press before the operating diameter ofthe hones can be changed. This limitation imposes not only a tediousburden on the user, but also an economically impractical amount of timeto complete a single honing operation.

Accordingly, itis a principal object of the present'im vention toprovide a honing attachment which may be employed with a conventionaldrill press with all of the versatility available only in elaborate andexpensive honing equipment. 7 Another important object of this inventionis the provision of a honing attachment for drill presses, whichattachment does not possess the serious limitations of presentlyavailable attachments and yet is no more costly.

A further important object of this invention is the provision of ahoning attachment especially adaptable'for use with drill presses, andwhich utilizes for its operation the normal functions of the drillpress.

Still another important object of this invention is the provision of ahoning attachment which is of simplified construction for economicalmanufacture, which is adaptable for use with any conventional drillpress, and which is characterized by a versatility of operation here- Onthe other hand, when the bore to be 34 which function by abutmentwiththe second bracket 2,925,690 Patented Feb. 23,- 1960 toforeobtainable only with large and expensive honing apparatus.

The foregoing and other objects and advantages of this invention willappear from the following detailed description, taken in connection withthe accompanying drawing, in which:

Fig. 1 is a fragmentary view in front elevation, partly in section, of ahoning attachment embodyingthe features of the present invention, thesame being shown in at tachment with a conventional drill press; 7

Fig. 2 is a sectional view taken along the line 2-2 in Fig. 1;

Fig. 3 is a sectional view taken along the line 3-3 in Fig. 1 andshowing the hone-supporting means in locked position; A f

Fig. 4 is a sectional view similar to Fig. 3 and showing.

the arrangement of parts in position for removal of the hones;

Fig. 5 is a fragmentary sectional view taken along the line 5-5 in Fig.4; and

Fig. 6 is a fragmentary. view in front elevation lustrating a secondmode of operation of the hone at tachment and drill press assembly.

As stated hereinabove, the hone attachment of the present invention isparticularly adaptable forum with a conventional drill press.Accordingly, there is illustrated in Figs. 1 and dot the drawing thoseelements of a conventional drill press which are pertinent to themounting and operation of the honing attachment; Thus, the drill pressincludes a hollow, housing 10 which supports a quill 12 for verticalreciprocation, by well known connection with a rotary hand wheel 14. Thelower end of the housing is split longitudinally and provided withspacedlugs 16 which are internally threaded to receive a clamping screw 18.This clamp arrangement functions to releasably secure the quill in anydesired position of extension within the housing, as is well known.

The connection of the operating handle 14 to the A bracket 22 extendslaterally from the lower end of the quill and normally supports thelower end of a vertically extending, externally threaded depth gauge rod24. Such support normally is effected by extending the rod freelythrough an opening 26 in. the bracket and.

securing it thereto by tightening a pair of nuts 28 against the oppositesurfaces of the bracket. The rod normally projects freely through anopening 30 in a second bracket- 32 projecting laterally from the housing10, and the rod normally is provided with a pair of adjustable stop nuts32 to limit the downward movement of the quill. 3

The quill is provided with an internal longitudinal bore in which anelongated spindle 36 is rotatably journaleda The upper end of thespindle is connected in well known manner to a source of power,conventionally an electric motor and pulley system, the latter beingshielded by a pulley guard 38, as illustrated in Fig. 6.

The lower-end of the spindle projects from the quill and is providedwith means by which to attach. a drill bit chuck. In the embodimentillustrated, the spindle is, provided with a conventional Jacobs maletaper 40 and the enlarged threaded section 42 which receives the. nut44. This nut performs several functions, among v which are those ofvassistingtherelease of a ch uck frictionally secured 'to' the taper, andof securing -titl ltti formsofattachmentnsuch as taper adapters androuters, which normally are not safely attached merely by frictionalengagement with the taper.

It will be understood that other types of drill presses providespindles-with other forms of connectors,-such as an internal femaletaper of the Well known Morse type. Adapters are available to effectinterchange of these various types-of connectors. Accordingly, thespecific type of. spindle connection is not pertinent to the presentinvention.

The bone attachment of thisinvention includes a cylindr-ical-sleeve 50having a longitudinal bore 52 which is reduced in diameter adjacent itslower end to provide the restricted bore -'54. The upper end of thesleeve is reduced in diameter to receive the annular bearing assembly,the inner race 56 thereof being secured to the sleeve betweentheshoulder 58'formed by the reduced section and the overlyingnut 60which is releasably engaged with threads formed on said reduced section.A bracket 62 issecured to the outer race 64 of the bearing assembly, asby-means of-the split clamp 66 andscrew -68 illustratedin Fig. 2. Thebracket is provided with a laterally-extending slot 70 which isdimensioned to receive releasably therein the lower end of the depthgaugerod 24 whichnormally'forms a part of the drill press. Thus,when-the honing attachment of this invention is mounted on a drillpress, the rod 24 is detached from the quill bracket and replaced uponthe sleeve bracket 62 within the-slot 70, with-the nuts 28 tighteneddown upon oppo site'sides-of-the bracket, as illustrated in Figs. 1 and6. A shaft 72 is mounted within the larger bore 52 of sleeve 50 forlongitudinal reciprocation'relative thereto. The extent of such relativereciprocation is confined within the limits'of-a longitudinal groove 74provided in'the surface of the shaft. This groove receives freelytherein the projecting end ofa set screw 76 secured to the sleeve '50. a

"The upperend of-the shaft 72 is provided with an internal female taper78 to accommodate the Jacobs male taper 40 provided on the spindle. Theperiphery of the upper end of the shaft is reduced in diameter toreceive the nut 44 'slidably thereover, and a snap ring 80 is receivedreleasably within an annular groove in this reduced section,-to limitthe upward movement of the nut. In this manner the shaft may be securedpositively to'the'spindle, not only bythe interengaging tapers, but alsoby tightening 'the-nut upon thethreaded segment of the spin'dle.

' The lower end of' the shaft 72- is provided withan axial socket 82which is traversed intermediate its ends by a diametrically extendingpin 84. This socket and pin-arrangement is adapted to receive and locktherein theshankend. 86 of'a hone mandrel. This shank end is providedwith a bayonet slot 88 for detachable cooperation with the pin 84.Forwardly of the mandrel shank is a -hone supporting-section 90. Thissection tapers uniformly forward to minimum thickness, and the forwardportion "ofthis-tapered section 'is provided with lateral wallsv 92which confine therebetween the opposed honesi94; 96. Each of the bonesis mounted on a wedgeshaped base 98 -whichtapers to minimum dimensiontoward the shanlg end, 86 0f the mandrel. The-tapeligof. thei hone bases98=--and; '-the hone supporting section 90 bly,;as will now bedescribed.

"The sleeve 50is threaded externally at. the 'bottomge' nd operation.

' 4 to receive the internally threaded locking cap 108 thereon. Thebottom end face of the sleeve is provided witha pair of diametricallyopposed radially'extending grooves 110 and 112 and the locking cap isprovided with a pair of diametrically opposed radially extending slots114 and 116. These pairs of grooves and slots are adapted forregistration in one position of adjustment, and this positionconveniently is located by the provision. of a ball and detent assembly,best illustrated in Fig. 5. The detent 118 is provided by an opening inthe locking cap, and the ball 120is located in'a hole 122 in'the sleeve,being urged resiliently toward the'detent by the backing spring 124.Thus, as the locking cap 108 and the sleeve 50 arerotated relative toeach other-in the direction to loosen the cap, a position is reached atwhich the ball enters the detent, and in this position the pair ofgrooves 110, 112 and the slots 114, 116 are aligned in cooperativeregistration (Fig. 4). The outwardly offset ends 100' and102 of the honerods then may be passed upwardly through the pair of slots in thelocking cap into seating engagement in the registering grooves in thesleeve, after which the sleeve and locking cap are rotated in thedirection to tighten the cap. In this manner the offset ends of the honerods are secured firmly within the end grooves of the sleeve (Fig. 3).

The bone attachment described hereinbefore provides, in combination witha conventional drill press, a versatility of operation heretoforeobtainable only with rather complex and expensive honing apparatus. Asexplained hereinbefore, certain honing operations are required to bemade'upon rather massive objects which require firm support in a fixedposition while the hone is passed through the hole to be sized. Thistype of operation is accommodated by the assembly illustrated in Fig. 1of the drawing. In this arrangement the quill rod depth gauge 24 issecuredat its lower end to the sleeve bracket 62 by means of theclamping nuts 28, and extends upwardly through the openings 26 and 30 inthe quill bracket 22 and housing bracket'32, respectively. A pair ofadjusting nuts 130, 132 are carried on the threaded rod in engagementwith the opposite sides of the quill bracket 22, and the upper pair ofabutment nuts 34 are disposed on the rod above the housing bracket.

By moving the pair of adjusting nuts 130, 132 along the rod, thedistance between the sleeve bracket 62 and the quill bracket 22 may bevaried, thus simultaneously varying the position-of the homes 94, 96along the length of the'tapered'section 90 on the mandrel.This-adjustment determines the operating diameter of the hones, as willbe apparent.

Accordingly, the operation of the assembly illustrated in Fig. l is asfollows:

With the quill 12 retracted into the housingto its maximum extent, bymanipulation of the operating handle 14, or byautomatic operation'of thereturn spring'assembly 20, the piece of work to be operated upon ispositioned upon the drill press table and the opening to be honed islocated directly under the bones 94, 96. With the operating diameter ofthe bones reduced to a minimum, by moving them forwardly along thetapered section 90 of the mandrel by adjusting the nuts 130, 132 toincrease the/spacing between the'br ackets 22 and 62, the operatinghandle then isr'nanipulated to draw the bones forwardly into theopening. to be honed. It .will be. understood that this. downwardmovement offlthe hones :is accompanied also by simultaneous downwardmovement ofthe entire assembly of the mandrel sleeve and quill. Thedepthto which the bones. and mandrel are drawn into the opening may beadjusted and set by. proper .adjustment of the stop nuts 34 in abutmentwith the housing bracket 32. Thisprovision advantageously prevents.extensionpf l the hones through the bore as the bones are worked backand forth" in the bore during the honing f With the drill press motorenergized torotate-the spindle and the attached assembly of the sleeve,mandrel and hones, the bones are reciprocated in the boreto hone thelatter. The adjusting nuts 130, 132 are rotated in successive incrementsin the direction to decrease the distance between the brackets 22 and62, whereby to draw the hones upwardly toward the shank end 86 of themandrel and thus' increase the operating diameter of the bones. Aftereach increase in hone diameter, the'hones arereciprocated in the boreuntil proper sizing has been achieved. Conveniently, the rod 24 may beprovided with a graduated scale 134 by which to determine the point atwhich the bore has been sized to proper diameter by the bones.Alternatively, the hone assembly may be retracted periodically from thebore being sized, and the diameter of the bore measured to determinewhen proper sizing has been accomplished.

In the honing of bores in small pieces, such as bushings, it isgenerally more convenient to be able to hold the piece in the hand andpass it concentrically over the fixed hones. This type of operation isaccommodated by the arrangement of the assembly illustrated in Fig. 6 ofthe drawing. In this arrangement the adjusting nuts 130 and 132 havebeen removed from the position on opposite sides of the quill bracket 22in Fig. l, to a position in which both are below the quill bracket. Theassembly of the sleeve and hones thus drops by gravity to the positionin which the upper pair of stop nuts 34 are in abutment with the housingbracket 32. If desired, these nuts may be placed in abutment withopposite sides of the bracket 32 to prevent upward movement of the honeassembly as the piece of work is forced upwardly around the hones.

With the quill bracket elevated to its uppermost position, as by meansof the spring assembly 20., the hones thus are adjusted to minimumdiameter. The piece of work 140 held in the hand 142 then is passedupwardly, concentrically over the bones and the operating handle 14manipulated to extend the quill and mandrel assembly, thereby expandingthe hones and enlarging the bore to proper size. This ultimate size maybe set on the calibrated rod 24 by proper adjustment of the pair ofadjusting nuts 130, 132 to the position at which the quill bracket 22abuts the upper surface of the nut 130.

From the foregoing it will be apparent that the honing attachment of thepresent invention provides, in combination with a conventional drillpress, a versatility of operation presently available only in much moreelaborate and expensive honing apparatus. For example, the assembly maybe arranged for honing massive pieces of work mounted in a fixedposition upon a drill press table (Fig. 1), or may be arranged toaccommodate hand manipulation of small parts (Fig. 6). In either mode ofoperation adjustment of the diameter of the hones may be made while theassembly is running, i.e. without shutting down the drill press motor.This is an important practical feature of the invention, since iteliminates the lost time resulting from the necessity of shutting downthe assembly for each adjustment of hone diameter, as is required withpresently available honing attachments.

All of the foregoing advantages furthermore are provided by the presentinvention in the form of an attachment of simplified and thereforeeconomical construction, and which is adaptable with speed and facilityto any conventional drill press. Accordingly, the present inventionafiords to those concerns requiring limited or intermittent honingoperations, all of the advantages of more elaborate and expensive honingapparatus, at but a fraction of the investment cost, since such concernsgenerally have one or more drill presses which are used for the morefrequent drilling operations. Thus, the attachment of the presentinvention is ideally suited to such smaller concerns as machine shops,metal casting shops, tool and die shops, jig and fixture shops,automotive garages, and others where limited and intermitshaft,

I tent honing operations, together with dictate the practical necessityfor inexpensive honing equipment.

It will be apparent to those skilled in the art that vari ous changes insize, shape, arrangement of parts and other details of constructiondescribed hereinbefore, may be made without departing from the scope andspirit of this invention. For example, the drill press and honingattachment may be arranged for operation in a'horizontal plane, as wellas in the vertical arrangement illustrated. Further, the honingattachment may be included as an integral part of a complete honingapparatus, should such permanent assembly be desired. Still further, itwill be recognized that the mandrel and hone assembly described andillustrated herein is but one of many commercially available types, andthat others may be employed with the driver assembly of this inventionmerely by modifying the forms of attachments at the forward ends of theshank 72 and sleeve 50. Accordingly, it is to be understood that theforegoing description is primarily illustrative of the invention and isnot to be considered as limiting the scope of the appended claims.

Having now described our invention and the manner in which the same maybe used, what we claim as new and desire to secure by Letters Patent is:

1. For use with a hone device having a rotary hone mandrel supporting abone for relative longitudinal adjustment, hone driving apparatuscomprising a housing, a quill movable longitudinally in the housing, aspindle rotatable in the quill, a shaft, spindle attaching means on theshaft, mandrel attaching means on the shaft, a sleeve member on theshaft, the sleeve member and shaft being movable longitudinally relativeto each other, means interconnecting the sleeve member and shaft forsimultaneous rotation, hone attaching means on the sleeve member,support means engaging the sleeve member for rotation of the latterrelative to the support means, and connecting means on the support meansfor selectively connecting the sleeve member to the housing and quill,whereby when the sleeve member is connected to the housing the bone isretained a fixed distance from the housing and the honing diameter isvaried by longitudinal movement of the quill, and when the sleeve memberis connected to the quill the honing diameter is maintained fixed andthe hone is moved longitudinally with respect to the housing.

2. The apparatus of claim 1 wherein the connecting means is adjustablefor varying the spacing between the sleeve member and the selected oneof the housing and quill.

3. The apparatus of claim 1 wherein the connecting means comprises athreaded rod extending from the support means freely through aperturedprojections on the housing and quill, and adjustable nuts on the rod forengaging a selected one of the projections.

4. For use with a bone device having a rotary hone mandrel supporting ahone for relative longitudinal adjustment, hone driving apparatusadapted for use with a drill press or the like having a housing, a quillmovable longitudinally in the housing and a spindle rotatable in thequill, the bone driving apparatus comprising a shaft, spindle attachingmeans on the shaft, mandrel attaching means on the shaft, a sleevemember on the shaft, the sleeve member and shaft being movablelongitudinally relative to each other, means interconnecting the sleevemember and shaft for simultaneous rotation, hone attaching means on thesleeve member, support means engaging the sleeve member for rotation ofthe latter relative to the support means, and connecting means on thesupport means for selectively connecting the sleeve member to thehousing and quill, whereby when the sleeve member is connected to thehousing the hone is retained a fixed distance from the housing and thehoning diameter is varied by longitudinal movement of the quill, andwhen the sleeve member is connected to the quill limited budgets,

7 the hqning diameter is maintained fixed and the hone irnQvedlongitudinally with respect tothe housing,

5." The apparatus of claim 4 wherein the connecting means is adjustablefor varying the spacing between the sleeve member vand the selected oneof the housing and quill.

6. The apparatus of claim 4 wherein the, connecting means comprises athreaded rod extending'from the support means freely'through aperturedprojections on the References Citedinthe file of this patent UNITEDSTATES PATENTS Johnson Aug. 25, Hasty c Apr. 15, Clyne Jan. 5, SkranApr. 22,

